If you have FILE and know the web root, you can write a webshell (provided secure_file_priv is not set to a restricted directory).
This exact flow appears repeatedly in , HackTheBox’s “Sequel” machine , and VulnHub’s “HackMePlease 1” challenge . It is not theoretical – it is the industry standard for MySQL‑based privilege escalation.
: All file import and export operations are completely disabled. Reading Local Files mysql hacktricks verified
Transfer the compiled dynamic library payload (such as those provided by Metasploit or SQLmap) into that directory using the INTO OUTFILE methodology. Create the function wrapper:
Tools like sqlmap store pre-compiled UDF binaries (e.g., lib_mysqludf_sys.so or lib_mysqludf_sys.dll ). If you have FILE and know the web
When dealing with web application firewalls (WAFs) and patched systems, standard SQL injection payloads often fail. The following techniques are recognized for their efficacy in bypassing simple filters. A. Data Exfiltration via HEX() and UNHEX()
Note: This requires the file to be readable by the OS user running the MySQL service, and the path must be absolute. Writing Arbitrary Files ( INTO OUTFILE ) : All file import and export operations are
Securing a MySQL deployment involves applying principles of least privilege and strict network isolation.
According to Rapid7's research, more than of identified MySQL servers were found not to enforce host‑based access controls. Among those, thousands of 64‑bit Ubuntu servers remain unpatched and fully vulnerable.